Re: [PATCH v5 1/3] arm64: cpufeature: introduce helper cpu_has_hw_af()
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2019-09-19 16:36:51
Also in:
linux-mm, lkml
On Fri, Sep 20, 2019 at 12:12:02AM +0800, Jia He wrote:
quoted hunk ↗ jump to hunk
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index b1fdc486aed8..fb0e9425d286 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c@@ -1141,6 +1141,16 @@ static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap, return true; } +/* Decouple AF from AFDBM. */ +bool cpu_has_hw_af(void) +{ + return (read_cpuid(ID_AA64MMFR1_EL1) & 0xf); +} +#else /* CONFIG_ARM64_HW_AFDBM */ +bool cpu_has_hw_af(void) +{ + return false; +} #endif
Please place this function in cpufeature.h directly, no need for an
additional function call. Something like:
static inline bool cpu_has_hw_af(void)
{
if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM))
return read_cpuid(ID_AA64MMFR1_EL1) & 0xf;
return false;
}
--
Catalin
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